The calculator in question is the TNM Classification for Laryngeal Cancer, specifically for the subglottis. TNM stands for Tumor, Node, Metastasis. This classification system is used by clinicians to stage laryngeal cancer and determine its severity. 

The TNM Classification for Laryngeal Cancer, subglottis, applies specifically to patients who have been diagnosed with laryngeal cancer in the subglottic region. This region is located below the vocal cords and above the trachea. 

The clinical utility of this calculator is to help clinicians determine the stage of the cancer, which is crucial for planning treatment and predicting prognosis. The TNM system takes into account the size and extent of the tumor (T), whether the cancer has spread to nearby lymph nodes (N), and whether the cancer has metastasized, or spread to other parts of the body (M).

There are no specific exclusion criteria for the use of the TNM Classification for Laryngeal Cancer, subglottis. However, it is not applicable to patients with laryngeal cancer in other regions of the larynx, or to patients with other types of cancer.

TNM classification for laryngeal cancer, subglottis

# Criteria
 ## Tumor classification
A. Tx: Primary tumor cannot be assessed
B. Tis: Carcinoma in situ
C. T1: Tumor limited to the subglottis
D. T2: Tumor extending to vocal cords with normal or impaired mobility
E. T3: Tumor limited to larynx with vocal cord fixation and/or invasion of paraglottic space and/or inner cortex of the thyroid cartilage
F. T4a: Moderately advanced local disease; tumor invading cricoid or thyroid cartilage and/or invading tissues beyond the larynx (such as the trachea, soft tissues of the neck including deep extrinsic muscles of the tongue, strap muscles, thyroid, or esophagus)
G. T4b: Very advanced local disease; tumor invading prevertebral space, encasing carotid artery, or invading mediastinal structures
## Lymph node classification
H. Nx: Regional lymph nodes cannot be assessed
I. N0: No regional lymph node metastasis
J. N1: Metastasis in a single ipsilateral lymph node (<= 3 cm in greatest dimension) and no extranodal extension
K. N2: Metastasis in a single ipsilateral lymph node (> 3 cm but <= 6 cm in greatest dimension), or metastases in multiple ipsilateral lymph nodes (none > 6 cm in greatest dimension), or metastases in bilateral or contralateral lymph nodes (none > 6 cm in greatest dimension); no extranodal extension
L. N3: Metastasis in a lymph node (> 6 cm in greatest dimension) and no extranodal extension, or metastasis in any lymph node with clinically overt extranodal extension
## Metastasis classification
M. M0: No distant metastasis
N. M1: Distant metastasis present

# Conditions
- B and I and M
- C and I and M
- D and I and M
- (E and I and M) or ((C or D or E) and J and M)
- (F and (I or J) and M) or ((C or D or E or F) and K and M)
- ((C or D or E or F or G) and L and M) or (G and (H or I or J or K or L) and M)
- (C or D or E or F or G) and (H or I or J or K or L) and N
- true