Fetal Lung Maturity L/S Ratio and Phosphatidylglycerol

Calculate fetal lung maturity from lecithin/sphingomyelin (L/S) ratio and phosphatidylglycerol (PG) status in amniotic fluid. L/S ≥2.0 and PG present indicates maturity with <1% risk of RDS in term infants.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
Advertisement

How It Works

Calculate fetal lung maturity from lecithin/sphingomyelin (L/S) ratio and phosphatidylglycerol (PG) status in amniotic fluid. L/S ≥2.0 and PG present indicates maturity with <1% risk of RDS in term infants

Each component has a specific meaning:

  • Lecithin/sphingomyelin ratio — The lecithin/sphingomyelin ratio recorded for the scenario being assessed.
  • Phosphatidylglycerol status in amniotic fluid — The phosphatidylglycerol status in amniotic fluid recorded for the scenario being assessed.

Note: Interpret the fetal lung maturity l/s result against the thresholds and context described above.

How to Use

Enter the lecithin/sphingomyelin ratio, phosphatidylglycerol status in amniotic fluid for the scenario you are assessing. Calculate fetal lung maturity from lecithin/sphingomyelin (L/S) ratio and phosphatidylglycerol (PG) status in amniotic fluid. L/S ≥2.0 and PG present indicates maturity with <1% risk of RDS in term infants. Use the fetal lung maturity l/s result to inform your calculation.

Related Calculators

Antenatal Corticosteroids

Hyper-niche Medical

Frequently Asked Questions