#1401 ·
bluegull18 said:Could someone please explain this coagulation panel to me:
1. Prothrombin Time (PT) 11 (reference interval 10-15 s)
1.13 (reference interval 0.70-1.30 ratio)
0.94 (reference interval 0.90-1.20 INR)
2. Activated Partial Thromboplastin Time (aPTT) 23 * (reference interval 25 - 33 s)
3. Fibrinogen 4.0 (ref. interval 2.1 - 4.0 g/l)
4. Thrombin Time 16 * (reference interval 17 - 21 s)
NOTE: PT INR is used to monitor oral anticoagulant therapy.
The recommended therapeutic value is 2.00 - 3.50.
The patient was referred for these tests because a capillary burst in the eye occurred spontaneously (no heavy lifting, physical exertion, sneezing, or coughing triggered it; there was no pain, but blood spread across the entire white of the eye). High blood pressure has been ruled out. The individual has been on oral contraceptives for years and takes thyroid hormone replacement for hypothyroidism.
Do these two values that fall below "normal" suggest any specific potential issues?
Thanks.
Dear bluegull18,
These results from the hemostasis system testing are quite interesting and can be difficult to interpret unless one specializes in this field (to be clear, I am not a hematologist and don't specialize in clotting disorders, so this response represents only my own thoughts and modest understanding of the subject matter).
First off, the deviations in aPTT and TT are quite minor.
Interestingly, clinical attention is usually focused on prolonged aPTT and TT—values that exceed the upper limit.
A shortened aPTT (as seen in the report above) is rarely the primary focus.
It is understood that a shortened aPTT can sometimes be part of an "acute phase response" (essentially the blood reacting to inflammation or injury). In such cases, it is typically transient; once the factor causing the acute phase reaction resolves, the aPTT values normalize. Additionally, poor sample collection is often cited as a possible cause for such findings.
What makes these results particularly interesting, and why I mentioned them as such, is that a shortened aPTT doesn't logically align with bleeding symptoms. If spontaneous bleeding occurs, one would generally expect aPTT values to be above the upper limit (prolonged aPTT) or, at the very least, within the normal range.
However, since there are clotting disorders where patients present with normal baseline results, and given that this individual has only undergone a few tests with values that deviate only slightly (albeit in an unexpected direction), I believe nothing definitive can be concluded here. It’s impossible to both confirm and rule out a hemostasis disorder based solely on this. This likely means further investigation will follow, guided by the clinical picture and a hematologist's assessment.
Best regards. 🙂