Does 1 unit (u) of platelets increase the platelet count by 30-60 x 10^9/L?

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Oo, ang 1 unit ng platelet concentrate ay tumataas ng platelet count ng 30-60 x 10⁹/L

Ang isang apheresis platelet unit (na katumbas ng 4-8 whole blood-derived units) ay dapat magtaas ng platelet count ng 30-50 x 10⁹/L, ngunit ang isang single whole blood-derived platelet concentrate ay tumataas lamang ng 5-10 x 10⁹/L. 1

Pagkakaiba ng Platelet Products

Mahalaga na maintindihan na may dalawang uri ng platelet transfusion products:

Apheresis Platelet Unit (Single-Donor)

  • Naglalaman ng approximately 3-4 x 10¹¹ platelets 2
  • Katumbas ng 4-8 whole blood-derived units 1
  • Expected increment: 30-50 x 10⁹/L 2, 1
  • Ito ang tinutukoy kapag sinasabi "1 unit" sa karamihan ng clinical practice 1

Whole Blood-Derived Platelet Concentrate (Single Unit)

  • Naglalaman ng approximately 0.7-0.75 x 10¹¹ platelets 1
  • Expected increment: 5-10 x 10⁹/L per unit 1
  • Kailangan ng 4-8 units para makuha ang parehong effect ng isang apheresis unit 2

Mga Factors na Nakakababa ng Expected Increment

Ang actual increment ay maaaring mas mababa dahil sa:

  • Sepsis at active infection - significantly nakakababa ng platelet increment 1
  • Splenomegaly - approximately 33% ng transfused platelets ay nag-pool sa spleen 1
  • Disseminated intravascular coagulation (DIC) at massive hemorrhage 1
  • ABO incompatibility - kailangan ABO-identical o ABO-compatible ang platelet concentrate para sa good yield 2, 1
  • Alloimmunization (HLA antibodies) 1

Clinical Application

Sa actual practice:

  • Ang standard dose para sa thrombocytopenic bleeding patient ay 4-8 platelet units o single-donor apheresis unit 2
  • Sa trauma patients na may massive transfusion, ang increment ay maaaring 5-10 x 10⁹/L lamang kahit standard adult dose 1
  • Para sa average-sized adults, rough estimate ay 2,000/μL per unit ng platelet concentrate 1

Pagsukat ng Adequacy

Ginagamit ang Corrected Count Increment (CCI) para sukatin kung adequate ang transfusion 1:

  • CCI Formula: (absolute increment × body surface area in m²) / (number of platelets transfused × 10¹¹) 1
  • CCI ≥ 5,000 = satisfactory response 1
  • Dapat sukatin ang post-transfusion count 10 minutes after transfusion 2

Common Pitfall

Ang pinakamalaking pagkakamali ay ang pag-assume na ang "1 unit" ay laging tumutukoy sa apheresis unit. Sa ICU setting, ang median increment ay 14 x 10⁹/L lamang (IQR -2 to 30) after single platelet transfusion, at halos kalahati ng patients ay walang increment 3. Kaya mahalaga na i-check ang post-transfusion count at hindi mag-assume na nag-increase ang platelet count dahil lang may na-transfuse 2.

References

Guideline

Platelet Transfusion Guidelines

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025

Guideline

Guideline Directed Topic Overview

Dr.Oracle Medical Advisory Board & Editors, 2025

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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