Carotene, β

CPT: 82380
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Test Details

Synonyms

  • Beta Carotene

Use

Confirm the diagnosis of carotenoderma; detect fat malabsorption; depressed carotene levels may be found in cases of steatorrhea.

Limitations

High levels are useful to rule out steatorrhea but lower values lack specificity. There is poor sensitivity. High in the serum of those ingesting large amounts of vegetables. The gold standard for confirmation of a diagnosis of malabsorption remains fat measurement of a 72-hour stool specimen.

Methodology

High-pressure liquid chromatography (HPLC)

Reference Interval

3−91 μg/dL

Additional Information

Vitamin A serum levels do not correlate well with liver stores. Carotenemia may be confused with jaundice. It is also reported high with some cases of diabetes mellitus, myxedema, chronic nephritis, nephrotic syndrome,1,2 liver disease, hypothyroidism, type I, IIA, and IIB hyperlipoproteinemia, and in a group of amenorrheic hypogonadotropic women.1 An inverse relationship between serum β-carotene and the risk of bronchogenic squamous cell carcinoma is reported.3 The highest carotene levels are found in the serum of faddists ingesting large amounts of vegetables.4 Oral leukoplakia responds well to β-carotene therapy.5 Low β-carotene levels are associated with oral contraceptives and smoking.6

Specimen Requirements

Specimen

Serum, protected from light

Volume

0.7 mL

Minimum Volume

0.4 mL

Container

Red-top tube or gel-barrier tube; amber plastic transport tube with amber top. (If amber tubes are unavailable, cover standard transport tube completely, top and bottom, with aluminum foil. Identify specimen with patient's name directly on the container and on the outside of the aluminum foil. Secure with tape.) For amber plastic transport tube and amber-top, order LabCorp N° 23598.

Patient Preparation

Patient should fast for 12 hours and abstain from alcohol for 24 hours prior to collection. For those who are younger than six months, draw prior to next feeding. Blood should be collected before breakfast in the morning and prior to any medication.

Collection

Specimen should be free from hemolysis. Protect from light. Transfer specimen to amber plastic transport tube.

Storage Instructions

Room temperature and protect from light.

Stability Requirements

Temperature

Period

Room temperature

14 days

Refrigerated

14 days

Frozen

14 days

Freeze/thaw cycles

Stable x3

Causes for Rejection

Specimen not protected from light; hemolysis; sample type other than serum received

Clinical Information

Footnotes

1. Kemmann E, Pasquale SA, Skaf R. Amenorrhea associated with carotenemia. JAMA. 1983 Feb 18; 249(7):926-929. 6823046
2. McNeely MD. Gastrointestinal function. In: Sonnenwirth AC, Jarett L, eds. Gradwohl's Clinical Laboratory Methods and Diagnosis. 8th ed. St Louis, Mo: Mosby-Year Book Inc;1980: 517-536.
3. Menkes MS, Comstock GW, Vuilleumier JP, Helsing KJ, Rider AA, Brookmeyer R. Serum beta-carotene, vitamins A and E, selenium, and the risk of lung cancer. N Engl J Med. 1986 Nov 13; 315(20):1250-1254. 3773937
4. Gerard SK. Serum carotene: A screening test for malabsorption. Pathologist. 1986 Apr; 36-37.
5. Garewal HS, Meyskens FL Jr, Killen D, et al. Response of oral leukoplakia to beta-carotene. J Clin Oncol. 1990 Oct; 8(10):1715-1720. 2213107
6. Palan PR, Romney SL, Vermund SH, Mikhail MG, Basu J. Effects of smoking and oral contraception on plasma beta-carotene levels in healthy women. Am J Obstet Gynecol. 1989; 161(4):881-885. 2801833

LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
001529 Carotene, Beta 2053-7 001529 Carotene, Beta ug/dL 2053-7

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The LOINC® codes are copyright © 1994-2017, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf