Erythrocyte folate levels: a clinical study.

Area of Science:

• Hematology
• Clinical Chemistry
• Nutritional Science

Background:

• Erythrocyte (RBC) folate levels are a key indicator of folate status.
• Serum folate levels are commonly used for diagnosis, but RBC folate may offer additional insights.
• Understanding the relationship between serum and RBC folate is crucial for accurate clinical assessment.

Purpose of the Study:

• To compare laboratory parameters and patient characteristics between low and normal RBC folate groups.
• To assess the correlation between serum and RBC folate levels.
• To evaluate the impact of RBC folate levels on diagnosis, treatment, and patient outcomes when serum folate is available.

Main Methods:

• Retrospective review of 110 inpatients and outpatients with defined RBC folate levels (≤175 ng/ml and >175 ng/ml).
• Comparison of clinical and laboratory data, including mean corpuscular volume (MCV), red cell distribution width (RDW), serum folate, and vitamin B12.
• Analysis of peripheral blood smear findings, LDH levels, and clinical parameters.

Main Results:

• Patients with low RBC folate had higher MCV and RDW, and lower serum folate and B12.
• No significant differences were observed in anemia severity, specific blood cell morphology, or other clinical factors.
• Serum and RBC folate levels demonstrated a strong correlation; low RBC folate impacted outcomes in 5% of cases.

Conclusions:

• Significant differences between low and normal RBC folate groups were not clearly defined beyond what serum folate could indicate.
• The diagnostic utility (sensitivity and specificity) of RBC folate levels is currently undefined.
• Prospective studies with advanced biochemical markers are needed to clarify the interpretation of RBC folate levels.