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HelpTest Code FFT4F T4, Free, Direct Dialysis
Specimen Required
Patient Preparation: Fasting is preferred (8-16 hours)
Supplies: Sarstedt Aliquot Tube 5 mL (T914)
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collections Instructions:
1. Draw blood in a plain red-top tube(s), serum gel tube(s) is acceptable.
2. Centrifuge and aliquot 1 mL of serum into a plastic vial.
3. Send refrigerate.
Secondary ID
91548Method Name
Equilibrium Dialysis, Chromatography/Mass Spectrometry
Reporting Name
T4, Free, Direct DialysisSpecimen Type
SerumSpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Frozen | 35 days | ||
| Ambient | 4 days |
Reject Due To
| Lipemia | Mild Reject; Gross Reject |
| Heparin plasma EDTA plasma | Reject |
Reference Values
|
Age |
Reference Range |
Unit of Measure |
|
(Adult) |
||
|
Adult (Males and Females) |
0.9-2.2 |
ng/dL |
|
(Pediatric) |
||
|
Prematures, 25-30 weeks Birth-7 days |
0.5-3.3 |
ng/dL |
|
Prematures, 31-36 weeks Birth-7 days |
1.3-4.7 |
ng/dL |
|
Cord Blood, >37 weeks |
1.2-2.2 |
ng/dL |
|
Birth-4 days |
2.2-5.3 |
ng/dL |
|
2 months to 2 years |
1.2-2.5 |
ng/dL |
|
3 to 17 years |
1.0-2.4 |
ng/dL |
|
(Pregnancy) |
||
|
First Trimester |
0.9-2.0 |
ng/dL |
|
Second Trimester |
0.8-1.5 |
ng/dL |
|
Third Trimester |
0.8-1.7 |
ng/dL |
CPT Code Information
84439
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| FFT4F | T4, Free, Direct Dialysis | 6892-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| Z1571 | T4, Free, Direct Dialysis | 6892-4 |