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Observer reliability in assessing placental maturity by histology
T Y Khong1, A Staples, R W Bendon
1Department of Pathology, Women's and Children's Hospital, Adelaide, Australia.
Journal of Clinical Pathology
|May 1, 1995
Summary
Histological assessment of placental maturity by experienced pathologists shows significant variability, with a mean error of 2.72 weeks. Clinical information can influence diagnoses, limiting the reliability of placental maturity evaluation.
Area of Science:
- Perinatal pathology
- Histology
- Obstetrics
Background:
- Accurate assessment of placental maturity is crucial for fetal well-being.
- Histological evaluation of placental villous maturity is a common diagnostic method.
Purpose of the Study:
- To evaluate the reliability of experienced perinatal pathologists in assessing placental maturity via histology.
- To determine the accuracy and consistency of histological placental maturity grading.
Main Methods:
- Five experienced perinatal pathologists assessed 24 H&E stained placental slides from 27, 31, 35, and 39 weeks' gestation.
- Slides were circulated three times, with correct or incorrect gestational age labels.
Main Results:
- The mean absolute error in gestational age assessment was 2.72 weeks.
- Only 54% of assessments were within two weeks of the correct gestation.
- Pathologists tended to misinterpret gestational age, influenced by provided labels.
Conclusions:
- Experienced pathologists struggle with reliable histological assessment of placental maturity.
- Provided clinical information, like gestational age labels, can significantly influence observer accuracy.
- Histological placental maturity assessment may require a six-week difference for detection, limiting its use as a marker for uteroplacental ischemia.