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CME Credit Offered
CME Credit Offered
Abstract Award
Abstract Award
Recording available 2/16-5/2
Recording available 2/16-5/2
AIUM Credit
AIUM Credit
Foundation Awardee
Foundation Awardee
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Abstract Award
Abstract Award
Foundation Awardee
Foundation Awardee

Poster Session 2

Category: Clinical Obstetrics

Poster Session 2

(485) Non-invasive point-of-care hemoglobin resting in an obstetric population

Wednesday, February 11, 2026
3:30 PM - 5:00 PM  
Objective:
To compare the accuracy of a non-invasive (finger sensor), point-of-care hemoglobin (Hb) monitoring device to the gold-standard blood test among pregnant patients. 

Study Design:
This cross-sectional study included pregnant patients across all trimesters undergoing routine venipuncture for Hb assessment during prenatal visits at a tertiary care center. We collected two device measurements at time of venipuncture and averaged the values. We also collected self-reported skin tone using the Monk Skin Tone scale. The p</span>rimary outcome was the difference between the device and blood Hb. We used the Bland-Altman plot to visualize data, assessed the independence of the bias, and calculated the Pearson Correlation coefficient overall and stratified by skin tone. Anemia was defined as Hb < 11 g/dL in the first and third trimesters and Hb < 10.5 g/dL in the second. 

Results:
We enrolled 124 participants, 38 (31%) in the first trimester, 40 (32%) in the second, and 46 (37%) in the third. The median perfusion index was 8 (IQR 5-10), indicating adequate perfusion during testing. Mean Hb was 11.6 g/dL (±1.1) for blood and 13.1 (±1.1) for the device. The device result was 1.5 g/dL (±1.1) higher than the blood result across all Hb levels, as demonstrated by Fig 1 and the test of independence of the bias (r=0.04; p=0.64). The overall Pearson correlation coefficient was 0.54 (p< 0.001) and did not vary notably when stratified by skin tone: light tones: r = 0.47 (p< 0.001), medium tones: r = 0.62 (p<0.001), and dark tones: r = 0.58, (p=0.01). The blood test identified 25 (20%) patients with anemia. The device identified 2, only one of which had anemia based on the blood test, yielding a sensitivity of 4% and specificity of 99%. 

Conclusion:
Results from the non-invasive point-of-care Hb monitoring device consistently overestimated venipuncture results by 1.5 g/dL. Future work should center on determining whether a device-specific anemia cutoff could increase device accuracy, this may improve rates of anemia screening.