Predicting haemoglobin level within 6 hours and after 24 hours after a caesarean section: are there such formulas to calculate them?

• Main Authors: Mohd Ariff@Ghazali, Nazhan Afeef, Ali, Saedah, Ab Mukmin, Laila
• Format: Article
• Language: English; English
• Published: Malaysian Society of Anaesthesiologists 2021
• Subjects: R Medicine (General)
• Online Access: http://irep.iium.edu.my/95915/13/95915_Predicting_Haemoglobin_level_6hours_abstract.pdf; http://irep.iium.edu.my/95915/14/95915_Predicting_Haemoglobin_level_6hours.pdf; http://irep.iium.edu.my/95915/; https://medicineandhealthukm.com/toc/16/3%20%28suppl%29

Background: We measured Haemoglobin (Hb) levels within 6 hours and after 24 hours in 134 Caesarean Section cases in Hospital Universiti Sains Malaysia in 2017. Methods: All blood loss from participants were measured gravimetrically and calculated after dry weights from the disposables and collecting bottles are excluded. Hb levels pre-CS followed by Hb within 6 hours and 24 hours post CS were taken.Data were tested by Multiple Linear Regressions where P <0.05 is considered significant. Results: Percentage blood loss, intraoperative fluid administration and patient previous scars were strong predictors for Delta Hb within 6 hours post CS and with exclusion of previous scar in Delta Hb after 24 hours post CS with P <0.05.Formula for Delta Hb within 6 hours post CS = 0.869 + (-0.055 x Percentage Blood Loss (%)) + (-0.001 x Fluid given intraoperatively (mls) + (0.205 x Previous scars (n))Formula for Delta Hb after 24 hours post CS = 0.631 + (-0.086 x Percentage Blood Loss (%)) + (-0.001 x Fluid given intraoperatively (mls) Confounders excluded are Body Mass Index (BMI), duration of surgery, total blood volume, estimated liquor, balance fluid given intraoperatively and after 24 hours, and parity. Conclusions: It is possible to estimate blood loss within 6 hours and after 24 hours after CS. The benefits will include maintaining normal Hb level and assessing need for transfusion for post CS.