> ## Documentation Index
> Fetch the complete documentation index at: https://docs.clinikapi.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Allergies

> Record and manage patient allergies and intolerances.

# Allergies

Allergies (FHIR `AllergyIntolerance`) record a patient's known allergies and adverse reactions to substances including medications, foods, and environmental agents. They track clinical status, criticality, and detailed reaction history.

## Record an Allergy

```ts theme={null}
const { data: allergy } = await clinik.allergies.create({
  patientId: 'pt_abc123',
  clinicalStatus: 'active',
  verificationStatus: 'confirmed',
  type: 'allergy',
  category: ['medication'],
  criticality: 'high',
  code: {
    system: 'http://www.nlm.nih.gov/research/umls/rxnorm',
    code: '7980',
    display: 'Penicillin',
  },
  onsetDateTime: '2019-06-15',
  recordedDate: '2024-01-10',
  recorderId: 'pract_dr456',
  reaction: [
    {
      substance: 'Amoxicillin',
      manifestation: ['Hives', 'Angioedema'],
      severity: 'severe',
      onset: '2019-06-15T14:30:00Z',
      exposureRoute: 'Oral',
      note: 'Patient developed hives within 30 minutes of first dose.',
    },
  ],
  note: 'Confirmed penicillin allergy — avoid all beta-lactam antibiotics.',
});
```

## Food Allergy with Multiple Reactions

```ts theme={null}
const { data: peanutAllergy } = await clinik.allergies.create({
  patientId: 'pt_abc123',
  clinicalStatus: 'active',
  verificationStatus: 'confirmed',
  type: 'allergy',
  category: ['food'],
  criticality: 'high',
  code: 'Peanut',
  reaction: [
    {
      substance: 'Peanut butter',
      manifestation: ['Anaphylaxis', 'Throat swelling', 'Difficulty breathing'],
      severity: 'severe',
      description: 'Severe anaphylactic reaction requiring epinephrine.',
    },
    {
      substance: 'Peanut oil',
      manifestation: ['Skin rash', 'Itching'],
      severity: 'mild',
    },
  ],
});
```

## Update Clinical Status

Mark an allergy as resolved:

```ts theme={null}
await clinik.allergies.update(allergy.id, {
  clinicalStatus: 'resolved',
  note: 'Patient completed desensitization therapy. No longer reactive.',
});
```

## Search Allergies

```ts theme={null}
// All active allergies for a patient
const { data } = await clinik.allergies.search({
  patientId: 'pt_abc123',
  clinicalStatus: 'active',
});

// High-criticality medication allergies
const { data: critical } = await clinik.allergies.search({
  patientId: 'pt_abc123',
  category: 'medication',
  criticality: 'high',
});
```

## Allergy Categories

| Category      | Description                                      |
| ------------- | ------------------------------------------------ |
| `food`        | Food substances (peanuts, shellfish, dairy)      |
| `medication`  | Medications (penicillin, sulfa drugs)            |
| `environment` | Environmental agents (pollen, dust, latex)       |
| `biologic`    | Biological substances (vaccines, blood products) |

## Criticality Levels

| Level              | Description                                         |
| ------------------ | --------------------------------------------------- |
| `low`              | Low risk — reaction is not life-threatening         |
| `high`             | High risk — potential for life-threatening reaction |
| `unable-to-assess` | Unable to assess the criticality                    |