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Merge pull request #388 from rcpch/eatyourpeas/issue302
centiles-for-measurements
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103 changes: 103 additions & 0 deletions
103
project/npda/general_functions/dgc_centile_calculations.py
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| import datetime | ||
| import json | ||
| import logging | ||
| import requests | ||
| from requests.exceptions import HTTPError | ||
| from django.conf import settings | ||
|
|
||
| logger = logging.getLogger(__name__) | ||
|
|
||
|
|
||
| def calculate_centiles_z_scores( | ||
| birth_date, observation_date, sex, observation_value, measurement_method | ||
| ): | ||
| """ | ||
| Calculate the centiles and z-scores for height and weight for a given patient. | ||
| :param height: The height of the patient. | ||
| :param weight: The weight of the patient. | ||
| :param birth_date: The birth date of the patient. | ||
| :param observation_date: The observation date of the patient. | ||
| :return: A tuple containing the centiles and z-scores for the requested measurement. | ||
| """ | ||
|
|
||
| url = f"{settings.RCPCH_DGC_API_URL}/uk-who/calculation" | ||
|
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| # test if any of the parameters are none | ||
| if not all( | ||
| [ | ||
| birth_date, | ||
| observation_date, | ||
| sex, | ||
| observation_value, | ||
| measurement_method, | ||
| ] | ||
| ): | ||
| logger.warning(f"Missing parameters in calculate_centiles_z_scores") | ||
| return None, None | ||
|
|
||
| if sex == 1: | ||
| sex = "male" | ||
| elif sex == 2: | ||
| sex = "female" | ||
| elif sex == 9 or sex == 0: | ||
| logger.warning( | ||
| "Sex is not known or not specified. Cannot calculate centiles and z-scores." | ||
| ) | ||
| return None, None | ||
|
|
||
| body = { | ||
| "measurement_method": measurement_method, | ||
| "birth_date": birth_date.strftime("%Y-%m-%d"), | ||
| "observation_date": observation_date.strftime("%Y-%m-%d"), | ||
| "observation_value": float(observation_value), | ||
| "sex": sex, | ||
| "gestation_weeks": 40, | ||
| "gestation_days": 0, | ||
| } | ||
|
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||
| ERROR_STRING = "An error occurred while fetching centile and z score details." | ||
| try: | ||
| response = requests.post(url=url, json=body, timeout=10) | ||
| response.raise_for_status() | ||
| except HTTPError as http_err: | ||
| logger.error(f"{ERROR_STRING} Error: http error {http_err.response.text}") | ||
| return None, None | ||
| except Exception as err: | ||
| logger.error(f"{ERROR_STRING} Error: {err}") | ||
| return None, None | ||
|
|
||
| if ( | ||
| response.json()["measurement_calculated_values"]["corrected_centile"] | ||
| is not None | ||
| ): | ||
| centile = round( | ||
| response.json()["measurement_calculated_values"]["corrected_centile"], 1 | ||
| ) | ||
| if response.json()["measurement_calculated_values"]["corrected_sds"] is not None: | ||
| z_score = round( | ||
| response.json()["measurement_calculated_values"]["corrected_sds"], 1 | ||
| ) | ||
|
|
||
| if centile is not None and centile > 99.9: | ||
| centile = 99.9 | ||
|
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| return (centile, z_score) | ||
|
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|
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| def calculate_bmi(height, weight): | ||
| """ | ||
| Calculate the BMI of a patient. | ||
| :param height: The height of the patient in cm. | ||
| :param weight: The weight of the patient in kg. | ||
| :return: The BMI of the patient. | ||
| """ | ||
| if height < 2: | ||
| raise ValueError("Height must be in cm.") | ||
| if weight > 250: | ||
| raise ValueError("Weight must be in kg.") | ||
| bmi = round(weight / (height / 100) ** 2, 1) | ||
| if bmi > 99: | ||
| return None | ||
| return bmi |
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