Test Code Hct Hematocrit

Aliases

HCT

Useful For

Used to determine the ratio of volume of red blood cells to the total volume of blood.

Collection Method

Venous draw, Capillary Draw

Minimum Volume

Adult: 1 mL, Pediatric 300 uL

Container

Purple (EDTA)

Preferred Specimen

Whole Blood

Acceptable Specimens

EDTA Whole Blood, BD EDTA MAP tube

Reference or Target Ranges

Males		Females
Birth – 7 days	42.0 – 60.0%	Birth – 7 days	42.0 – 60.0%
8 – 14 days	39.0 – 60.0%	8 – 14 days	39.0 – 60.0%
15 days – 1 month	31.0 – 55.0%	15 days – 1 month	31.0 – 55.0%
2 – 5 months	28.0 – 42.0%	2 – 5 months	28.0 – 42.0%
6 months – 1 year	33.0 – 40.0%	6 months – 1 years	33.0 – 40.0%
2 years	33.0 – 42.0%	2 years	33.0 – 42.0%
3 – 5 years	33.0 – 43.0%	3 – 5 years	35.0 – 44.0%
6 – 11 years	35.8 – 42.4%	6 – 11 years	35.7 – 43.0%
12 – 15 years	37.3 – 47.3%	12 – 15 years	36.3 – 43.4%
Adults	38.8 – 50.0%	Adults	34.9 – 44.5%

Reportable Units

%

Critical Value

Parameter	Low value	High value
Hematocrit (any age)	<21%	>65%
Hematocrit (0 – 24 hours)	<42%	>65%

Reasons for Rejection

Hemolysis Threshold	N/A
Icterus Threshold	N/A
Lipemia Threshold	N/A
Other	Clotted; QNS, Contaminated; Improperly labeled

Specimen Stability

Ambient	Up to 24 hours at room temperature
Refrigerated (4°C to 8°C)	24 Hours
Frozen(-70°C to 0°C)	N/A

Performance Information

Days and Time Performed	24/7
Expected Turn Around Time	Stat within 1 hour of arrival in lab Routine within 4 hours in lab
Stat Availabilty	Yes
Performing Bench	UH, WCH Hematology
Methodology/Method Description	Sysmex – Hematocrit (HCT) is measured as a ratio of the total RBC volume to whole blood using cumulative pulse height detection.

Special Handling

Room Temp

CPT Codes

85014