Labcorp test code for methylmalonic acid

Methylmalonic Acid, Urine (LABCORP) Test Code. 1231100359. Alias/See Also. LAB7619: Methylmalonic Acid, Urine | LABCORP EAP: 716365 ... The CPT Codes provided in this ...

The 99.5 percentile, determined from the analysis of 200 dried blood spots of unaffected controls, for methylmalonic acid (MMA), methylcitric acid (MCA), and homocysteine (HCY), are 1.58 nmol/mL, 0.62 nmol/mL, and 9.9 nmol/mL, ... (CPT) code(s) information for each test or profile.Labcorp test details for Methylmalonic Acid, Urine. Managing Your Health. Shop for Health Tests; Explore Women's Health; Annual Wellness GuidelinesLabcorp test details for Urea Nitrogen. Uremia is best evaluated with creatinine as well as urea nitrogen. 1 In both prerenal and postrenal azotemia, for instance, BUN is apt to be increased somewhat more than is creatinine; however, in a series of dehydrated children with gastroenteritis who had metabolic acidosis and increased anion gap, 88% had BUN …Use. Diagnose pheochromocytoma, VMA is of value for evaluation of hypertension, diagnose and follow up neuroblastoma, ganglioneuroma, and ganglioneuroblastoma. Most neuroblastoma patients excrete excess HVA in 24-hour collections. If VMA and HVA are both used in work-up, up to 80% of all cases will be detected.Hereditary hemochromatosis (HFE related) is an autosomal recessive iron storage disorder. Patients may have a genetic diagnosis of hereditary hemochromatosis and never show clinical symptoms. Clinical symptoms typically appear between 40 to 60 years in males and after menopause in females. Signs and symptoms may include organ damage, primarily ...See list of participating sites @NCIPrevention @NCISymptomMgmt @NCICastle The National Cancer Institute NCI Division of Cancer Prevention DCP Home Contact DCP Policies Disclaimer P...Labcorp test details for Amino Acid Profile, Quantitative, Urine. Skip to main content Close Menu. Logins. Individuals & Patients. Find a Lab View Test Results Pay ... Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC; 700140: Amino Acid Profile, Qn, Urine: 35087-6: 700069: Taurine: umol/g Cr: 28595-7:TEST: 700068. CPT: 82139. Print Share Include LOINC® in print. 3 - 6 days. Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests.

For a complete list of Quest Diagnostics tests, please adjust the filter options chosen, or refer to our Directory of Services. Methylmalonic Acid, Urine with Creatinine - Methylmalonic Acid (MMA) is useful to diagnose and monitor Vitamin B12 (cobalamin) deficiency, and to diagnose and monitor patients with methylmalonic acidemia.Methylmalonic acidemia. E71.120 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2024 edition of ICD-10-CM E71.120 became effective on October 1, 2023. This is the American ICD-10-CM version of E71.120 - other international versions of ICD-10 E71.120 may differ.Use. Detect bacterial pathogenic organisms in the stool; diagnose typhoid fever, enteric fever, bacillary dysentery, Salmonella infection. Indications for stool culture include: 1. • Bloody diarrhea. • Fever. • Tenesmus. • Severe or persistent symptoms. • Recent travel to a third world country.The methylmalonic acid test is often used along with the vitamin B-12 test or to clarify ambiguous vitamin B-12 test results. The methylmalonic acid test may also be ordered if the results of other blood tests are abnormal. For instance, abnormal results from a homocysteine test may prompt your doctor to order the methylmalonic acid test.1. Positive or negative fluorescence. A negative test is strong evidence against a diagnosis of SLE but not conclusive. 2. The titer (dilution) to which fluorescence remains positive (provides a reflection of the concentration or avidity of the antibody). Many individuals, particularly the elderly, may have low titer ANA without significant ...

Methylmalonic Acid (LABCORP) Test Code. 99901000985. Alias/See Also. LAB835: Methylmalonic Acid, Serum | LABCORP EAP: 706961 ... The CPT Codes provided in this ...Use. Detect bacterial pathogenic organisms in the stool; diagnose typhoid fever, enteric fever, bacillary dysentery, Salmonella infection. Indications for stool culture include: 1. • Bloody diarrhea. • Fever. • Tenesmus. • Severe or persistent symptoms. • Recent travel to a third world country.A serum methylmalonic acid level may be used to confirm vitamin B 12 deficiency when it is suspected but the serum vitamin B 12 level is normal or low-normal. C 18Labcorp test details for Homocyst(e)ine. Specimen received not separated from cells (do not respin a gel-barrier tube to harvest additional serum); gross hemolysis (eg, bright red or cherry red); whole blood tube without a gel separator; plasma from a light blue-top (sodium citrate) tube or yellow-top (ACD) tube used for coagulation studies (liquid citrate tubes have a dilutional effect of ...

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The mucic acid test is used to identify the presence of the sugar galactose in food or in synthetics manufacture. When concentrated nitric acid is heated together with galactose, a...Elevated levels of methylmalonic acid (MMA) result from inherited defects of enzymes involved in MMA metabolism or inherited or acquired deficiencies of vitamin B12 (cobalamin) or its downstream metabolites. Acquired deficiencies of vitamin B12 are much more common and can be due to intestinal malabsorption, impaired digestion, or poor diet.An MMA test is most often used to diagnose a vitamin B12 deficiency. This test is also used to diagnose methylmalonic acidemia, a rare genetic disorder. Symptoms of this disorder can range from mild to severe and may include vomiting, dehydration, developmental delays, and intellectual disability. The test is usually included as part of a ...Nov 9, 2021 · The methylmalonic acid (MMA) test may be used to help diagnose an early or mild vitamin B12 deficiency. It may be ordered by itself but generally with a homocysteine test as a follow-up to a vitamin B12 test result that is in the lower end of the normal range. There are currently no official guidelines for screening for average-risk adults.

Methylmalonic Acid Blood Print Overview Specimen ... Clinical Overview Test Mnemonic. MMA. CPT Codes. 83921 - QTY (1) LOINC ® 13964-2 ... Methylmalonic Acid. Order Name METHYLMA S Test Number: 2051075 Revision Date 12/12/2022 ... Labcorp Test Code: 706961: CPT Code(s) 83921: Lab Section: Reference Lab Test Code. 30517. CPT Code(s) 83090, 83921. CPT Code is subject to a Medicare Limited Coverage Policy and may require a signed ABN when ordering. Print. Test Code. 30517. ... Methylmalonic Acid: Tandem Mass Spectrometry • Homocysteine: Enzymatic. Reference Range(s) Methylmalonic Acid: 87-318 nmol/L: Homocysteine : Male <11.4 umol/L: FemaleMethylmalonic Acid Urine Test (Labcorp) A Methylmalonic Acid (MMA) Urine test is most often used to aid in the diagnosis of Vitamin B12 deficiency . Methylmalonic Acid production is linked to the body's Vitamin B12 level. When B12 levels drop, more MMA is produced. An MMA test is one of the earliest indicators of Vitamin B12 deficiency.Sep 11, 2017 · Methylmalonic Acid, Urine (24-hour or Random) ... Performing Labcorp Test Code: 716365 : Notes: Labcorp Test Code: 716365: CPT Code(s) 83921: Lab Section: Reference Lab Coding tests have become a common part of job interviews for technical positions. Employers use these tests to assess a candidate’s coding skills, problem-solving abilities, and ov...Synonyms: B12 Deficiency, Cobalamin Deficiency, Methylmalonate, MMA, Methylmalonic Aciduria Primary Code: X706961 | Secondary Code: L1008 Specimen Collection Criteria: Collect (Preferred): 1 Gold-top serum separator tube (SST).(Minimum Whole Blood: 0.6 mL) Also Acceptable: 1 plain Red-top tube or 1 Dark Green-top Heparin tube.(Minimum …Methylmalonic aciduria and homocystinuria, CblC type (OMIM #277400) is the most common disorder of cobalamin intracellular metabolism, an autosomal recessive disease, whose biochemical hallmarks are hyperhomocysteinemia, methylmalonic aciduria and low plasma methionine. Despite being a well-recognized disease for pediatricians, … Clinical Significance. Methylmalonic Acid - The Methylmalonic Acid (MMA) test is used in the diagnosis of acquired cobalamin (vitamin B12) deficiency in adults and to screen for inherited organic acidemia in neonates and infants. Elevated MMA in either blood or urine indicates vitamin B12 deficiency in adults, with MMA acting as a functional ... Keep yourself and your loved ones safe by testing for COVID-19. With over 50 million COVID-19 tests performed since the start of the pandemic, our tests continue to detect all of the variant changes being tracked by the CDC, including the Delta variant. There are four ways to get the trusted Labcorp COVID-19 PCR test. Urinary methylmalonic acid, when increased, is an early and sensitive indicator of vitamin B12 (cobalamin) deficiency. This test can also be used to monitor patients with methylmalonic aciduria. Diagnosis of methylmalonic aciduria requires an organic acid panel and appropriate clinical history. Per 24h calculations are provided to aid ... Test Menu. We offer a wide-range of tests that ... A critical result is defined as a test result that represents ... Methylmalonic Acid · Microalbumin/Creatinine ...

Methylmalonic Acid, Urine with Creatinine - Methylmalonic Acid (MMA) is useful to diagnose and monitor Vitamin B12 (cobalamin) deficiency, and to diagnose and monitor patients with methylmalonic acidemia. ... Test Code. 91032. CPT Code(s) 82570, 83921. Ordering Restrictions may apply. Please provide SERVICE AREA INFORMATION to …

Jun 6, 2016 ... Meditech Code: Labmodule: Lab Where Test is. Performed: Lab Test Code: ... Acid)(Serotonin metabolite), 24 Hour Urine ... Methylmalonic Acid, Serum ...Use. Detect the presence of fecal fatty acids and neutral fat. Increases in neutral fat are commonly associated with pancreatic exocrine insufficiency. Increase in stool total fats (neutral fats, soaps, and fatty acids) is likely to be associated with small bowel disease.Endocrine. Calcium-Pentagastrin Stimulation. ACTH Stimulation Test (Cosyntropin) Aldosterone Suppression. C-Peptide Suppression. Captopril Test. Clonidine Suppression. Corticotropin-releasing Hormone Stimulation. Dexamethasone Suppression Screening for Cushing Disease/Syndrome.Essential Fatty Acids - Essential fatty acids can’t be produced by your body. Find out about essential fatty acids omega-3 and omega-6 and how they should affect your diet. Adverti...B. Test Principle. Methylmalonic acid (MMA) is analyzed by LC-MS/MS as dibutylester after liquid-liquid extraction using a modification of the method of Pedersen et al. [6]. MMA is extracted from serum (75 μL) along with an added internal standard (d3-MMA) via liquid-liquid extraction with tert-butylmethylether/H+ [7]. This test was developed and its performance special determined by Labcorp. It has not been free or approved on the Food also Drug Administration. Population View Values for Serum Methylmalonic Acid Concentrations and Inherent Relationship with Age, Sex, Race-Ethnicity, Supplement Use, Kidney Function and Serum Vitamin B12 in the Post-Folic Tart ... Homocyst (e)ine. TEST: 706994. CPT: 83090. Print Share Include LOINC® in print. 1 - 2 days. Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional ...

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Jun 21, 2023 · Methylmalonic acid (MMA) is not often required; however, it may be useful in the following circumstances: Detect early and/or mild Vitamin B12 deficiency, when vitamin B12 results are equivocal (they neither rule in nor rule out deficiency), and there is a high clinical suspicion of deficiency. Diagnose/monitor patients with methylmalonic ... The patient with high cholesterol (>240 mg/dL) should have a lipid panel. Patients with cholesterol levels between 200−240 mg/dL plus two other coronary heart disease risk factors should also have a lipid panel. 1 In addition to application in screening programs for evaluation of risk factors for coronary arterial disease, lipid profiling may ...For a complete list of Quest Diagnostics tests, please adjust the filter options chosen, or refer to our Directory of Services. Methylmalonic Acid, Urine with Creatinine - Methylmalonic Acid (MMA) is useful to diagnose and monitor Vitamin B12 (cobalamin) deficiency, and to diagnose and monitor patients with methylmalonic acidemia.Order a Methylmalonic Acid (MMA) Serum Test to measure the level of MMA in the blood to help detect early or mild vitamin B12 deficiency. Buy online! ... Buy LabCorp: $99.00 . Sample Report. Test Code: 706961. CPT Code: …Methylmalonic Acid, Serum or Plasma. Test Code: 706961: Performing Lab: LABCORP: CPT Code: 83921 ... 0.6 mL (Note:This volume does NOT allow for repeat testing). …For this GeneReview, the term "isolated methylmalonic acidemia" refers to a group of inborn errors of metabolism associated with elevated methylmalonic acid (MMA) concentration in the blood and …This test is set up in the Labcorp computer as a sequential series of tests to comply with customer needs and bill for testing that is performed. ... Reflex Table for Acid Fast Culture; Order Code Order Name Result Code Result Name UofM Result LOINC; Reflex 1: 183396: Organism ID by MALDI Rflx AST: 183403: Organism ID by MALDI: 76346-6: Reflex 2:LabCorp appointments should be scheduled through an individual lab testing site, according to LabCorp.com. Same-day appointments can be made with at least two hours notice, and wal...LabCorp is a healthcare diagnostics company that handles everything from routine labwork to drug testing. This diagnostics service offers ways to schedule, view and manage your app...Viral transport medium acceptable for collection of influenza specimens in 1 mL or 3 mL volumes can be used to transport swabs for COVID-19 testing. For swabs in saline: OP, NP or anterior nasal swabs may be placed in 1 to 3 mL of sterile saline (0.85 to 0.9%) in a sterile screw cap container. Do not use vacutainer or "pop-top" tubes. ….

We would like to show you a description here but the site won’t allow us.Alias 2. 706961. Place of Service. LabCorp. Additional Information. Sendout to LabCorp - for current Test details refer to the LabCorp order code link below. LabCorp Order Code. 706961. Print.Methylmalonic Acid, Urine (24-hour or Random) Order Name Methylm Acid Ur Test Number: 5613575 Revision Date 09/11/2017. Test Name Methodology LOINC Code; Methylmalonic Acid ... Performing Labcorp Test Code: 716365 : Notes: Labcorp Test Code: 716365: CPT Code(s) 83921: Lab Section:Methylmalonic Acid (MMA), Serum LabCorp. SKU. 929-l. LabCorp Test #: 706961, CPT: 83921. Serum methylmalonic acid (MMA) measurement is used to evaluate individuals with signs and symptoms associated with vitamin B12 deficiency or congenital methylmalonic academia. MMA is a four-carbon molecule which is a product of the …Serum methylmalonic acid (MMA) measurement is used to evaluate individuals with signs and symptoms associated with vitamin B 12 deficiency 1-7 or congenital methylmalonic academia. 8,9 Limitations This test was developed, and its performance characteristics determined, by LabCorp.Labcorp is a leading provider of medical laboratory services, offering a wide range of tests and screenings to help individuals maintain their health and well-being. Labcorp has nu...Python has become one of the most popular programming languages in recent years. Its simplicity, versatility, and extensive library support make it a top choice for developers. As ...For a complete list of Quest Diagnostics tests, please adjust the filter options chosen, or refer to our Directory of Services. Methylmalonic Acid, Urine with Creatinine - Methylmalonic Acid (MMA) is useful to diagnose and monitor Vitamin B12 (cobalamin) deficiency, and to diagnose and monitor patients with methylmalonic acidemia.Labcorp test details for Chlamydia/Gonococcus, NAA. Skip to main content Close Menu. Logins ... Nucleic acid amplification (NAA) Reference Interval. No Chlamydia trachomatis or Neisseria gonorrhoeae detected. LOINC® Map. Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC; 183194: Chlamydia/GC … Labcorp test code for methylmalonic acid, In this approach, a second-line assay (vitamin B12) falls in an "equivocal" range. It has been suggested that boarderline B12 levels (200-400 ng/L) should be followed up with measuring methylmalonic acid levels. Methylmalonic acid levels below the upper limit of the reference range (0-378 nmol/L) are strongly suggestive of normal B12 status., The concentration of total homocysteine (tHcy) in serum and plasma is elevated in both folate and cobalamin deficiencies, whereas methylmalonic acid (MMA) in serum, plasma, or urine is a specific marker of cobalamin function. The combined measurement of both metabolites is useful for the diagnosis and follow-up of these deficiency states. In addition, tHcy is elevated under various pathologic ..., Essential Fatty Acids - Essential fatty acids can’t be produced by your body. Find out about essential fatty acids omega-3 and omega-6 and how they should affect your diet. Adverti..., Methylmalonic Acid, Serum. Test Code: LAB835 ... For current specimen requirement information use the link on the Labcorp Order Code below. , Dynacare - METHYLMALONIC ACID SERUM. METHYLMALONIC ACID SERUM. Test Details. Test Name : METHYLMALONIC ACID SERUM. Alternative Test Names : METHYLMALONIC ACID SERUM. Code:723S. Test Overview : Support the diagnosis of cobalamin (B12) deficiency. Test Preparation Instructions : N/A. Turnaround Time:14 …, The Methylmalonic Acid Urine Test, GC/MS/MS, measures the level of MMA in urine to help detect early or mild vitamin B12 deficiency. LabCorp Buy LabCorp: $109.00, Feb 19, 2023 ... CPT: 81404. [MMACSF] Methylmalonic Acid. SPECIMEN REQUIRED: Frozen CSF. TUBE OR CONTAINER: Sterile tube. SPECIMEN VOLUME: 1 mL. MINIMUM VOLUME ..., Viral transport medium acceptable for collection of influenza specimens in 1 mL or 3 mL volumes can be used to transport swabs for COVID-19 testing. For swabs in saline: OP, NP or anterior nasal swabs may be placed in 1 to 3 mL of sterile saline (0.85 to 0.9%) in a sterile screw cap container. Do not use vacutainer or "pop-top" tubes., Alias 2. 706961. Place of Service. LabCorp. Additional Information. Sendout to LabCorp - for current Test details refer to the LabCorp order code link below. LabCorp Order Code. 706961. Print., Blood MMA Test. Healthy people will have MMA below 370 nmol/L (nanomoles per liter) or 0.37 umol/L (micromoles per liter). The normal range varies somewhat between laboratories and some labs also provide a low-normal limit. The cut-off value that points to vitamin B12 deficiency has not been universally agreed upon., Labcorp test details for Homovanillic Acid (HVA), Random Urine. Skip to main content Close Menu. Logins. Individuals & Patients. Find a Lab View Test Results ... Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC; 120246: Homovanillic Acid, Random Ur: 070016: Creatinine, Random U: mg/dL: 2161-8:, TEST: 700068. CPT: 82139. Print Share Include LOINC® in print. 3 - 6 days. Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests., In today’s competitive job market, coding tests have become an integral part of the interview process for technical roles. Whether you are a software engineer, web developer, or da..., In today’s competitive job market, coding tests have become a common part of the interview process for tech professionals. These tests are designed to assess a candidate’s technica..., Labcorp test details for Fatty Acids, Free (Nonester) Skip to main content Close Menu. Logins. Individuals & Patients. Find a Lab View Test ... Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC; 081893: Fatty Acids, Free (Nonester) 15066-4: 081893: Fatty Acids, Free (Nonester) mEq/L:, Methylmalonic Acid, Serum or Plasma. Test Code: 706961: Performing Lab: LABCORP: CPT Code: 83921 ... 0.6 mL (Note:This volume does NOT allow for repeat testing). Storage/Transport Temperature: Refrigerate: Specimen Handling: Separate serum or plasma from cells within one hour of collection. Specimen Type: Serum OR plasma:, Specimen Collection Container/Tube: Red-top tube, gel-barrier tube OR green-top (heparin) tube: Volume: 2 mL: Minimum Volume: 0.6 mL (Note:This volume does NOT allow for repeat testing)., Homocyst (e)ine. TEST: 706994. CPT: 83090. Print Share Include LOINC® in print. 1 - 2 days. Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional ..., Cobalamin, Methionine, and Methylmalonic Acid Pathways, Serum. Useful For. Screening and monitoring patients suspected of or confirmed with an inherited disorder of methionine, cobalamin, or propionate metabolism. Evaluating individuals with suspected deficiency of vitamin B12. Method Name. Liquid Chromatography Tandem Mass Spectrometry (LC-MS ..., Methylmalonic acidemia is a disease that varies in age of onset, severity, and responsiveness to vitamin B12 treatment. The most severe form of the disease is the most common, has onset in early infancy, and is least responsive to vitamin B12 treatment.5 Symptoms may include1,5: • Vomiting. • Hypotonia (low muscle tone) • Lethargy (lack ..., Methylmalonic Acid Urine Test (Labcorp) A Methylmalonic Acid (MMA) Urine test is most often used to aid in the diagnosis of Vitamin B12 deficiency . Methylmalonic Acid production is linked to the body's Vitamin B12 level. When B12 levels drop, more MMA is produced. An MMA test is one of the earliest indicators of Vitamin B12 deficiency. , Keep yourself and your loved ones safe by testing for COVID-19. With over 50 million COVID-19 tests performed since the start of the pandemic, our tests continue to detect all of the variant changes being tracked by the CDC, including the Delta variant. There are four ways to get the trusted Labcorp COVID-19 PCR test., Serum methylmalonic acid (MMA) measurement is used to evaluate individuals with signs and symptoms associated with vitamin B12 deficiency1-7 or congenital methylmalonic academia.8,9. This test was developed, and its performance characteristics determined, by LabCorp. It has not been cleared or approved by the US Food and Drug Administration ..., Order this Methylmalonic Acid Serum Test, which measures the level of MMA in the blood to help detect early or mild vitamin B12 deficiency. Methylmalonic acid (MMA) is a substance produced in tiny amounts necessary for human metabolism and energy production. Vitamin B12 is responsible for two critical enzymatic reactions that promote cell ..., LabCorp; Lab One (Quest Diagnostics) ... Test Code LAB835 Methylmalonic Acid, Quantitative, Serum Additional Codes. Mayo Test Code: MMAS. Useful For., Labcorp test details for MHPG, 24-Hour Urine. 10 - 14 days. Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. , 0.0−14.9 mg/24 hours. If a borderline elevation of 5-HIAA is found, sample should be recollected following withdrawal of dietary and medication sources that might elevate 5-HIAA (see Patient Preparation). Nontropical sprue may cause a slight increase in urinary 5-HIAA. 5-HIAA levels are lowered by renal insufficiency and after small bowel ..., ICD-10 Code Set Info. The ICD-10-CM code set replaced the ICD-9-CM code set on October 1, 2015, for covered entities under the Health Insurance Portability and Accountability Act (HIPAA). ICD-10-CM uses different formatting and an expanded character set. Labcorp provides ICD-10 coding resources that may be helpful for your …, Coding assessment tests have become increasingly popular among employers as a way to evaluate the technical skills of potential candidates. These tests are designed to assess a can..., Component Test Code* Component Chart Name LOINC; 0055663: Vitamin B12 Status: 2132-9: 0055664: Methylmalonic Acid, Serum: 13964-2, This test is intended for use as an aid in the diagnosis of HIV-1 or HIV-2 infection, including acute or primary infection. Presence of HIV-1 or HIV-2 RNA in the plasma of patients without antibodies to HIV-1 or HIV-2 is indicative of acute or primary HIV-1 or HIV-2 infection. This assay may also be used as an additional test, when it is ..., Laboratory findings for B 12 deficiency include decreased serum B 12 levels, increased methylmalonic acid and megaloblastic anemia. 2-6 Impaired hemoglobin synthesis associated with B 12 deficiency is characterized by abnormal maturation of erythrocyte precursors in the bone marrow, which results in the presence of megaloblasts with ... , Chey WD, Fendrick AM. Noninvasive Helicobacter pylori testing for the "test-and-treat" strategy: A decision analysis to assess the effect of past infection on test choice. Arch Int Med. 2001 Sep 24; 161(17):2129-2132. 11570943