Lab Notes : Guide to Lab & Diagnostic Tests by Tracey B Hopkins

By Tracey B Hopkins

Here’s the reference you want to clarify, arrange, and deal with sufferers sooner than, in the course of, and after universal lab and diagnostic checking out.

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Extra info for Lab Notes : Guide to Lab & Diagnostic Tests

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Osmolality, Urine 24-hr urine: 300–900 mOsm/kg Random sample: 50–1200 mOsmol/kg water . Random, timed or 24-hr urine collection. Refrigerate specimen during collection. ■ Osmolality is a measure of the number of particles in solution. ■ Used to assess electrolyte and fluid balance, the kidneys’ ability to concentrate urine, renal disease, diabetes insipidus (DI), and syndrome of inappropriate antidiuretic hormone secretion (SIADH). ■ Determination of both urine and serum osmolality aids in interpretation of results.

Red-top tube. ■ Administration of dexamethasone suppresses ACTH and should suppress cortisol levels in healthy people. ■ Helpful in determining cause of increased cortisol levels (adrenal tumor, pituitary tumor, or ectopic ACTH-producing tumor). 24 01Hop-01 2/4/05 12:08 PM Page 25 Copyright © 2005 F. A. Davis. 5 ␮g/mL Ͼ500 ng/ml Ͼ500 ng/mL Ͼ500 ng/mL Ͼ2 ng/mL Ͼ12 ␮g/mL Ͼ20 ␮g/mL Ͼ25 ␮g/mL Ͼ5 ␮g/mL Ͼ750 ng/mL Ͼ250 ␮g/mL Ͼ80 ng/mL Ͻ85 or Ͼ500 ng/mL Ͼ500 ng/mL Ͼ3 mg/L Ͼ2 ng/mL Ͼ200 ng/mL Ͼ7 ␮g/mL Ͼ400 ng/mL Ͼ150 ␮g/mL Ͼ1 ␮g/mL peak: Ͼ12 ␮g/mL trough: Ͼ2 ␮g/mL (Continued on following page) LABS A-F 01Hop-01 2/4/05 12:08 PM Page 26 LABS A-F Copyright © 2005 F.

Lavender top tube. ■ Reticulocytes are juvenile RBCs. ■ Used in to evaluate the etiology of anemia, erythropoietin therapy, and recovery from myelosuppression. 48 02Hop-02 2/4/05 12:10 PM Page 49 Copyright © 2005 F. A. Davis. 49 Rheumatoid Factor (RF) Ͻ1:20 titer (agglutination method) . Red-top tube. ■ Used in the diagnosis of rheumatoid arthritis. ■ RF is an antibody that attaches to immunoglobulin G (IgG). ■ Also elevated in collagen vascular diseases, infections, cancer, and MI. Rotavirus Antigen Negative .

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