A Patient Was Drawn for PT and PTT Testing

question 32

Multiple Choice

A patient was drawn for PT and PTT testing. The laboratory professional noticed that the packed cell volume appeared abnormally elevated. A CBC was also drawn with the coag and the hematocrit was 63%. A new Na Citrate tube was prepared to correct for the elevated hematocrit and a repeat coag sample was drawn. How much anticoagulant is needed for a 4.5ml draw?

• A) 1.9 ml
• B) 3.1 ml
• C) 3.4 ml
• D) 1.6 ml

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Definitions:

Computerized Axial Tomography

A medical imaging technique that uses X-rays to create detailed cross-sectional images of the body, commonly known as a CAT scan.

Electroencephalography

A non-invasive procedure that records electrical activity of the brain using sensors placed on the scalp.

Magnetic Resonance Imaging

A medical imaging technique used in radiology to form pictures of the anatomy and the physiological processes of the body in both health and disease.

Polygraph Test

A test that seeks to determine whether the test taker is telling the truth by measuring physiological responses such as respiration level, perspiration level, and heart rate. Also known as a lie detector test.