|Alternate:||1:1 Mix PTT|
|Includes:||PTT 1:1 mix PTT|
|Available:||Routine: 3 hours, Stat: 30 minutes.|
|Container:||Blue top tube (3.2% sodium citrate)|
|Temperature:||Transport to the laboratory within 30 minutes of collection.|
|Rejection:||Tube not filled to line, specimen hemolyzed.|
|Normal:||6 months to adult. 25.7-37.8 Ranges not established for ages under 6 months.|
|Uses:||A 1:1 mix is only a screening procedure for factor deficiency. A 1:1 mix with a mildly prolonged APTT may mask a lupus inhibitor, and a weak inhibitor may be diluted enough to normalize the APTT. A APTT that is abnormal and corrects into normal range after the PTT MIX is suggestive of a factor deficiency. A APTT Mix cannot be performed on a APTT that is in the normal range.|
|Limitations:||APTT testing may be affected, by a number of commonly administered drugs. See same limitations as noted for APTT testing.|
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