NICU tool

NICU Blood Pressure Percentile Calculator

Look up neonatal SBP, DBP and MAP percentiles with Starship postconceptional-age charts and Samanta et al. Indian normative data, including the 5th percentile as a lower-range reference.

Input parameters

Enter gestational age at birth and postnatal day. Postconceptional age for the Starship chart (26-44 weeks) is calculated automatically as gestational age plus postnatal day.

Clinical pearls

The 5th percentile (Samanta et al.) is a lower-percentile reference and should be interpreted with clinical context, not as a standalone hypotension diagnosis.
Values at or above the 95th percentile warrant evaluation for neonatal hypertension.
The 99th percentile corresponds to severe hypertension thresholds in the Starship guideline.
Mean arterial pressure helps track perfusion goals alongside systolic and diastolic trends.

Percentile summary (mmHg)

Enter gestational age and postnatal day to see results.

Starship reference (postconceptional age)

Metric	50th percentile	95th percentile	99th percentile
Systolic	-	-	-
Diastolic	-	-	-
MAP	-	-	-

Source: Starship neonatal blood pressure guideline.

Samanta et al. — Indian neonates (-, day -)

Source: Samanta M, et al. Normative Blood Pressure Data for Indian Neonates. Indian Pediatr. 2015;52:669-673. Term/preterm uses the standard 37-week gestational age cutoff; the preterm group pools all preterm neonates in the study rather than being week-specific.

Visualise percentile curves

Charts plot the Starship curves against postconceptional age. Your calculated point is highlighted as a dot on hover/tooltip; percentile lines stay in the legend above.

View full published Samanta et al. reference tables

Table I — Term vs preterm by postnatal day (mmHg)

Day	Metric	Group	Mean (SD)	5th	10th	25th	50th	75th	90th	95th	99th
Day 4	SBP	Term	74 (7)	62	64	68	74	78	82	84	88
	SBP	Preterm	62 (7)	46	54	58	62	66	72	74	78
	DBP	Term	54 (7)	42	43	50	54	60	62	62	66
	DBP	Preterm	43 (6)	32	34	40	42	47	50	52	56
	MAP	Term	61 (6)	48	50	56	60	66	68	70	73
	MAP	Preterm	49 (6)	38	41	46	48	53	56	58	62
Day 7	SBP	Term	78 (6)	66	70	74	78	82	84	87	90
	SBP	Preterm	66 (7)	54	58	62	66	70	74	77	82
	DBP	Term	58 (6)	50	50	55	60	62	64	66	72
	DBP	Preterm	47 (6)	38	40	42	48	50	55	56	62
	MAP	Term	64 (5)	54	56	61	66	68	70	72	75
	MAP	Preterm	53 (5)	44	46	50	54	57	60	63	66
Day 14	SBP	Term	81 (5)	72	74	78	82	84	88	90	90
	SBP	Preterm	70 (7)	60	61	66	70	75	78	80	85
	DBP	Term	61 (6)	52	54	60	60	64	68	70	74
	DBP	Preterm	51 (6)	40	42	50	50	55	60	60	62
	MAP	Term	68 (5)	58	61	66	68	71	74	75	79
	MAP	Preterm	58 (6)	47	49	56	57	61	66	66	68

Table II — By gestational age at birth (mmHg)

Percentiles published for each gestational week: 10th, 50th, 90th, 95th and 99th.

Week	Percentile	Day 4			Day 7			Day 14
Week	Percentile	SBP	DBP	MAP	SBP	DBP	MAP	SBP	DBP	MAP
32	10	50	32	41	55	40	45	60	40	48
	50	58	40	46	62	42	50	68	50	56
	90	68	50	54	72	52	59	75	55	61
	95	77	50	56	74	55	59	75	56	62
	99	78	56	58	74	56	61	76	58	64
33	10	54	35	43	61	40	48	62	42	49
	50	64	42	48	68	45	52	68	50	56
	90	74	51	56	74	52	59	78	58	64
	95	77	52	56	78	55	60	78	58	64
	99	82	58	66	80	60	66	82	58	66
34	10	55	30	41	60	40	48	62	44	50
	50	62	42	48	65	48	53	68	50	56
	90	70	48	53	72	52	58	76	55	62
	95	78	50	56	74	54	59	78	58	64
	99	78	55	61	78	58	64	82	60	67
35	10	59	38	45	62	42	50	68	48	55
	50	64	44	50	68	50	56	73	52	59
	90	69	51	56	74	54	60	78	58	64
	95	72	52	56	76	55	61	78	60	66
	99	74	58	62	78	62	66	78	62	67
36	10	55	40	46	62	42	50	65	50	56
	50	66	44	51	68	50	57	74	55	60
	90	75	52	59	78	56	63	80	62	66
	95	76	55	61	78	58	64	82	62	68
	99	77	55	62	82	62	66	86	65	68
37	10	62	42	49	68	50	56	74	52	60
	50	72	52	58	76	56	62	78	60	66
	90	80	60	66	82	62	68	88	62	69
	95	82	62	66	85	62	68	88	68	73
	99	84	64	70	87	68	74	90	72	77
38	10	64	47	53	70	52	58	74	54	61
	50	73	53	60	78	58	65	80	60	67
	90	79	62	66	84	62	69	86	66	72
	95	82	62	67	84	64	70	88	68	74
	99	84	66	72	88	68	74	90	72	76
39	10	66	44	51	70	50	58	74	55	61
	50	76	54	61	78	60	66	82	60	68
	90	82	62	67	84	62	69	88	68	73
	95	84	62	68	86	66	72	90	70	75
	99	88	66	72	90	72	74	92	75	80
40	10	68	50	56	72	53	60	78	58	64
	50	77	58	64	82	60	68	84	64	70
	90	84	62	70	87	66	72	90	70	75
	95	87	64	70	88	68	74	90	70	76
	99	88	68	74	90	72	77	90	76	81

How to interpret neonatal blood pressure percentiles

Neonatal blood pressure varies with gestational age, postnatal age, weight, and concurrent conditions such as bronchopulmonary dysplasia, renal disease, or steroid exposure. Percentile charts from well-characterised cohorts help distinguish physiologic maturation from concerning low or high readings.

This calculator reports both references from a single gestational age and postnatal day: the Starship postconceptional-age percentiles (50th, 95th and 99th) for hypertension thresholds, and the Samanta et al. Indian normative percentiles (including the 5th percentile) for the same neonate.

When values approach the 95th percentile, confirm cuff size, repeat measurements during quiet sleep, and review secondary causes including umbilical arterial catheter thrombosis, renal anomalies, or chronic lung disease.

Values at or beyond the 99th percentile should prompt escalation per unit protocol. Lower-percentile values require clinical correlation with perfusion, urine output, lactate and overall illness severity rather than a single cut-off alone.

Frequently Asked Questions

What is a normal blood pressure for a neonate?

Neonatal blood pressure depends on gestational age, postnatal age and clinical state. This calculator reports published percentile references for SBP, DBP and MAP rather than a single universal normal value.

What is the difference between the Starship and Samanta references?

The Starship reference uses postconceptional age from 26 to 44 weeks and reports 50th, 95th and 99th percentiles. The Samanta et al. reference uses Indian normative data by term/preterm status and postnatal day (4, 7 or 14), and includes the 5th percentile. This calculator computes both from a single gestational age and postnatal day entry.

Does the 5th percentile diagnose neonatal hypotension?

No. The 5th percentile from Samanta et al. is a lower-percentile reference from healthy Indian neonates. Hypotension decisions should also consider clinical perfusion, urine output, lactate and unit protocol.

What if my gestational age is outside 32-40 weeks for the Indian data?

The main calculator uses the Samanta et al. term/preterm bucket (Table I), which applies regardless of exact gestational week. The full Table II reference, published only for 32-40 weeks by exact gestational week, is available in the collapsible reference tables below.

How does the calculator get a postconceptional age if I only enter gestational age at birth?

Postconceptional age is calculated automatically as gestational age at birth plus postnatal day, then used to look up the Starship percentiles. You do not need to calculate it separately.

What if my neonate is on postnatal day 1, 2, 3, or another day not measured by Samanta et al.?

The Starship reference still works for any postnatal day because it uses continuous postconceptional age. Samanta et al. only measured blood pressure on postnatal days 4, 7 and 14, so for other days the calculator shows the nearest of those three measured days and clearly notes when this substitution was made.

References

These calculators adapt published neonatal blood pressure reference tables for bedside percentile lookup. They support clinical interpretation and do not replace unit protocols or clinician judgment.

Starship Child Health. Blood pressure / hypertension in neonates. Source for postconceptional-age 50th, 95th and 99th percentile charts used in the Starship calculator.
Samanta M, et al. Normative Blood Pressure Data for Indian Neonates. Indian Pediatr. 2015;52:669-673. Source for Indian term/preterm and gestational age-wise SBP, DBP and MAP percentiles, including the 5th percentile in Table I.

NICU Drug Dosage Neonatal medication dosing support. Neonatal Sepsis NICE Early-onset infection risk support. AAP Phototherapy Chart Bilirubin phototherapy and exchange thresholds. Pediatric BP Calculator Age, sex and height percentile BP for older children. Fetal Weight Percentile Calculator SGA, AGA and LGA classification by gestational age. Thompson Score Calculator HIE / neonatal encephalopathy score. Ballard Score Gestational age assessment tool.